Eucrites are igenous surface or near surface rocks ejected from the asteroid Vesta, the largest of the solar system, by an impact (Vesta's equatorial escape velocity is 0.36 km/s "only")
This slice of the meteorite NWA 13160, classified eucrite, is a window on the asteroid Vesta geological history, that allow us to see with naked eye a chapter of its evolution : this is a fine breccia, composed of multiple mostly sub milimetric fragments of eucritic material (larger are 2mm), and was formed by numerous impacts that shaterred the rocks on the surface of vesta during millions of years. This fragmental breccia by structure represents the surface of the asteroid, and so is a regolithic breccia as well.
FROM THE METEORITICAL SOCIETY DATABASE :
The meteorite is a fine-grained fragmental breccia composed of basaltic clasts and black melt rock clasts up to 2 mm in size set into a clastic matrix. Basaltic clasts and matrix are dominantly composed of exsolved pyroxene and plagioclase grains up to 900 µm in size. Some pyroxenes show compositional zoning indicating a low degree of thermal metamorphism. Minor phases include silica, FeS, chromite, ilmenite, and metallic iron.
Geochemistry: low-Ca pyroxene: Fs41.0±9.1Wo5.8±1.2 (Fs28.8-53.7Wo3.5-8.1, FeO/MnO=24-30, n=17); Ca-pyroxene: Fs34.4±9.4Wo36.7±6.2 (Fs24.5-48.4Wo26.4-43.5, FeO/MnO=25-29, n=22); calcic plagioclase: An91.6±0.4 (An90.7-92.0, n=12)
Sent with certificat signed by the original owner of the meteorite (Fabien Kuntz, as refered on the Meteoritical Society page)
- Belangrijkste mineraal / Naam meteoriet
- NWA 13160 - Meteoriet van Asteroid Vesta - Igneous (basalt) - Fragmental (regolithic) Breccia -
- Minerale vorm / Soort meteoriet
- Achondrite meteoriet
- 25×12×3 mm
- 2,36 g
- Oorsprong (Regio/Stad)
- Hoofdplanetoïdengordel /
- Oorsprong (Land)